#include <vtkBoundedPointSource.h>
#include <vtkCamera.h>
#include <vtkFitImplicitFunction.h>
#include <vtkGlyph3D.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkSphere.h>
#include <vtkSphereSource.h>

int main(int, char*[])
{
    vtkNew<vtkNamedColors> colors;

    double radius = 1.0;
    vtkNew<vtkBoundedPointSource> points;
    points->SetNumberOfPoints(1000000);
    points->SetBounds(-2.0, 2.0, -2.0, 2.0, -2.0, 2.0);

    vtkNew<vtkSphere> sphere;
    sphere->SetRadius(radius);

    vtkNew<vtkFitImplicitFunction> fit;
    fit->SetInputConnection(points->GetOutputPort());
    fit->SetImplicitFunction(sphere);
    fit->SetThreshold(0.01);
    fit->Update();
    std::cout << fit->GetOutput()->GetNumberOfPoints() << " out of "
              << points->GetNumberOfPoints() << " tubeFilter2 are within "
              << fit->GetThreshold() << " of the implicit function" << std::endl;

    vtkNew<vtkSphereSource> sphereSource;
    sphereSource->SetRadius(radius * 0.05);

    vtkNew<vtkGlyph3D> glyph3D;
    glyph3D->SetInputConnection(fit->GetOutputPort());
    glyph3D->SetSourceConnection(sphereSource->GetOutputPort());
    glyph3D->ScalingOff();
    glyph3D->Update();

    vtkNew<vtkPolyDataMapper> glyph3DMapper;
    glyph3DMapper->SetInputConnection(glyph3D->GetOutputPort());

    vtkNew<vtkActor> glyph3DActor;
    glyph3DActor->SetMapper(glyph3DMapper);
    glyph3DActor->GetProperty()->SetColor(
            colors->GetColor3d("Banana").GetData());

    // Create graphics stuff
    //
    vtkNew<vtkRenderer> ren1;
    ren1->SetBackground(colors->GetColor3d("CornflowerBlue").GetData());

    vtkNew<vtkRenderWindow> renWin;
    renWin->AddRenderer(ren1);
    renWin->SetSize(512, 512);
    renWin->SetWindowName("FitImplicitFunction");

    vtkNew<vtkRenderWindowInteractor> iren;
    iren->SetRenderWindow(renWin);

    // Add the actors to the renderer, set the background and size
    //
    ren1->AddActor(glyph3DActor);

    // Generate an interesting view
    //
    ren1->ResetCamera();
    ren1->GetActiveCamera()->Azimuth(120);
    ren1->GetActiveCamera()->Elevation(30);
    ren1->GetActiveCamera()->Dolly(1.0);
    ren1->ResetCameraClippingRange();

    renWin->Render();
    iren->Initialize();
    iren->Start();
    return EXIT_SUCCESS;
}